SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea95e858968d653b38f5bbd89cd779c0a546af53ee543e125fb3dad4784222e' 
  AND token = 'YG7CPZJli3YCKgoDrfvFuri9oawy+PjbJLbJSZBKtBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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