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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28eb4a4d069ac0d1a61193204681774986a9e7186bd3acaf28c4a63c08d54ae4' 
  AND token = 'rc6syP+8rYHT3ubygG6b/MxUWKQ31j4hF4zAHItNWWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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