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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7effbd22b87e5e4b86d90557c8c31c048e639d4e91a017f2fde523d53d9b300d' 
  AND token = 'g3SPjrHd9uFTrofoiUiEtqiKhMJ8ZEszCvrrx05HQ6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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