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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd73edf1848a18e76728fa994d0b667f12a1177e43f9b7839d6b7a46c41e154' 
  AND token = 'OwIUI3atXXwHJXZg46EvJM/ta7KdFdfdZuhqpYUXq7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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