SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb93737e9f6ac7fbb456dbc5c09a674e70d4060cfd77e5d7940598483f9b224c' 
  AND token = 'QAZ6vimZuPgwE+B1Rm8S6BOOqpvtLbRJupzW1q9c7vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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