SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad5de18dfbf66c2c3c0c939db64255c07be04fdaea451b2e158a17c0749a4bd' 
  AND token = 'V2rCJmxtn0AUfUGtCTrVTquHtGOevEwkx3wB9/zYP7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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