SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79abd41633ca8f620dd2b2a57ca2b5d637ee0ff89299d6276918c1147e98fed9' 
  AND token = 'bz6Aru2YC9J/ZRYZMiQxXv+Bz0RbYtPQSEHD0Oiudqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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