SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa80741866b415d3ef3c6f96456d31072825d7ef0e5b6a8fd70c901a23d30bf' 
  AND token = 'cp4sm74mBwBK0Xh4XuCl/O6fExkoQEqIBi2PmJ5H+zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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