SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097e1fab162a5aa29402084ab35b1f329cfffd1dc402e7d6754e5337d42b6fb8' 
  AND token = 'nHPz5mFAqYc8LlDEVAegc9tfFnjJwBoprlNXlKkvbtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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