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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab610d32abc68cbf95706501edee885f4941f760c862a45bf44f81a02951a29' 
  AND token = '1dAFgZ8sQu6Yn7rO10ajPkuhfZx2iEbVBjU9Y7KdTVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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