SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffba84fa0af73247203b1177b25b567e3c2e93a889691af5f188cdb37063cbaa' 
  AND token = 'CDrin6VZmCkgr10mPrwqc3tYYx+aXumzhl4RVhoHEY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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