SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b81604ed3020d0bd1ef285540ae1f8303941dbbdd15cb317c1450d8f5b7f4e' 
  AND token = 'eXhxmqhXUerw91kVoGf+AQgLYZs7m66h/BpjzFIB4A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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