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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18397b6247caa03558397272fa66e2bd59ebf8fc7d584939026e522d24ee8a2c' 
  AND token = 'Q20wLSNrfsHQo0AhLcaorSW0XbQRRZZMoyX5rVmGJFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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