SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1309107702b2b95aa524132dcedd548b9f246f716044069e02a998b830360a9' 
  AND token = 'jOzvZfb0kkju8jMBewPDiMqgvmgJX76GLwF4bWLhUFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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