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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c9dfd35ebaecee123969e3cf5576a13906082c2af76d23c2b9e04f5925b502' 
  AND token = 'Zyv2ijtxHuQLeeWIOnDx5nt0XcLeYAJqemcx0J186vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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