SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0cdbc5bf1c11ac7c7b91722dd386669079ccd273408df47cd132a7d56bfd5a4' 
  AND token = 'H4JDjA5YYVRUHCmG76USnELg4xkjNK2PHok6/otlCzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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