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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b7c33213768c63174c7675574d7a6f8c028fe2a55b38c9e64083f508279cbc' 
  AND token = '1hxHgfxcj7O+xjpIujHD+zMtEFxRes5mF3g55UL4aQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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