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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e654d20dbd40b3bde59e21ac7733f53641462c8907677372d7ff0c35f25555' 
  AND token = 'K7zRMQA6sFUUCgCZ0D5gm1a3pgR71/HDPjn3sZJPq6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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