SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5a494b4ba5b3da4651e77b20982977c5d8cd251d94842a7b963deb6987fb23' 
  AND token = 'fApgiOUdYyqJFhU/gWobX3fVAQxplGN94LzBAPBpVU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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