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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937790b982a0ae96dd295ff26ec9d9932fbaf2be8d061799e884f90d1d4f73e4' 
  AND token = 'j2Jr3dUo05BxWqvd1T/6CeeWoXaVu2N6uqWSX5SY250=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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