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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b9e1283700dc3e8199a9a3b8a116088a7a671aa13da7eadbd3677a747837ac' 
  AND token = 'JN4pi3HJ0Rq+9AUX0Z5zSYeWcEzrIlndYC95iq3faRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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