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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5e4942b2ec7613e8ef85d8ce116d010f59730634b24df223725a5dded960b4' 
  AND token = 'VH52hFj7+qrYbS5bZiAp+SkLfxT5LpDQbN62zrUpsSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}