SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36054992196cd4d574b5c07d495ae58105ec6b9872a51d29d459a1ff072a31d5' 
  AND token = 'E8blL0ZomJg/bgFx8IDgpRc5HDHvTFzHupqcNG/XhSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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