SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6bc8a9fff7b408b717eb1bf7f7052a42a61949e8612be4277d4c6b88fdad52' 
  AND token = 'VBfn9JAp3MKgk6tw6K7vdnoSiuz1YPvw2rzXcBRgS+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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