SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bc29fac9fe8decb8887718bb005e0b51b3ba4677cb76261c44c4237bec1737' 
  AND token = 'PJNoQv2MmjTOGeZPdvBs+Cjg5dCnmKdPI/c3gLRaJlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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