SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e332e00d2ff48eef4ccb52e4abebeb5a03393a09d158586ae260f664bf89bef' 
  AND token = 'VGmsdGW50o0m+1iPTHPnIks6VrNyxb/vm8tJljUNHnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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