SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e165ef5a817f69c89c6303cbad85848c9ed42794888f8a47a6f280d2dbbcf557' 
  AND token = 'vFyK7XvouxZYH4uOQOkJm2lyUnsGWTNUj0uSLqnfBTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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