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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9ae324c139353e750ec0ca76b56893c811c1fb20a4ed73fa73b7e9a92d0da5' 
  AND token = 'OnlX7XVS9Q+JZXUr2CZSD5rj1HG2FAyAJQKDMVCE4XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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