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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b818eff15f870e383cc8d5d5af569661d97b7f5f32ec85fa5fb2db9a7e987f' 
  AND token = 'dp0i0ucbgWpwK30xf389Tr5uyuaL5E+KM7gWHfOwuOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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