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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904766c25f7b38c95f1e05dfee6a552856163089a9681b31e4eddf06490065bc' 
  AND token = 'N2Orm6syb9xgbLKhwkAcTd8jXfTiYWud/YoQhkAnv10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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