SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4727b405f98f99c83d724a2803a4b095d34c184468e3bd8f884ecb2e83c49fdd' 
  AND token = 'HhtZmYg6okqmGOGRKBeLZFl1pzJD/8sftZfxziCqrd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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