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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f8ec0df21868c8e173a0ffd7ce27a348cf913135fd0a70ae411fecc7124e59' 
  AND token = 'F/osg9g1zvz27OkWuAizi+F7c4chdqu3HQOauIWbZQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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