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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54d0fa8fe6489e19c916b5be8c32c632bcb48e90c6b95bd70c8ac89de28847c' 
  AND token = 'xaE983lWaBM4LsQrHWq5RkeB0i+P0QRM99XExTx+42Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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