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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff27466a28de530b7f0736b9559d1e666829d7ef919799c7fdb8aca0cde282c' 
  AND token = 'KHiAZKEC4Dv6B1IEFgNLdKzFEjaZckE13xbJ5UmstJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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