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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761fbd5938e90517742a6c2b359435d78205ec2cb3b7eabf789ecb3edb56eef4' 
  AND token = 'jKXfo7oVG/kH9b7nVOF4TVqB9G6M5GAgQOSGqiHd5ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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