SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e12bf8ae7d7d2945ce92d033c1b9284754936a3b03a1608d9da187723c9216c' 
  AND token = 'TCbbYl7sdb1I7SOZLYKv7zZAvx/rmwKpOIwHoqhduGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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