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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c923ab081b9cd25efd8c22853aab593c610bc3068159fc083029ae9043069d' 
  AND token = 'jR1RcyNw6QjbkMzkE1HGGZZFThs3ZeUtRFncYNIFMK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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