SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bcf519249ac43ac63b30ead615bd6a299dfb4c23fdecb9921086133b2537bf9' 
  AND token = 'LIhl/wuA7jB93iKVrUOGZBOHWGshucb1huaIPABF5qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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