SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da6015fd2770fbb430d70a31cf9efb82600d66fd5a3b7ba88b78fea983f2f63' 
  AND token = 'lZJoxV38Wi+fruzr/dGGx2UGgQKMCmanrOLKq/lS4Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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