SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febacb560db64d13ac93be2e2767cea5e1791e49df2566dd1817a2f1953f06b2' 
  AND token = 'YM8R4UJTwjiqKh2O/kmrlnwcPYkGWde96Gg6cHZIW4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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