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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ada2b588713ef674b5045e6dc29c3926e5914aa403c340ca5120a6a1e321be' 
  AND token = '77J8xMgm/gaHhqJ2qvDNyCehKhdbjSNT7GyqvpjIAoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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