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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15314a7d3a844c23e1858aa70f31e169f8b79c2b68f0f1ae03faafba95330af' 
  AND token = 'jMvlhwmEgm9jDeZeLjbWs8s3/FxSxPCU1xqL358L+0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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