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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd101db1e3ab01c852382271821bc77b9116d8843baa55b49b55c15d33bbdbd84' 
  AND token = 'hOaykZX+EyKFf4LomeY4UUOA/bZOiTS0Y+vkz46AaDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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