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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa724cc11e6272104b130aeb8b08255f9946695fa39ef1ec458f47136a14120d' 
  AND token = 'WgBpZw+zQBQuxor1U6Pa35OpVsjt+8eScC9ONn9fav8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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