SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0658cae5d7673509242ef4de279936ac58b66ed97d05185273ce6e7efb056cf5' 
  AND token = 'kra4u1XTZgnuEo/4Yajv1dF6llVJnjWJv6RYwCJKgmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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