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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17cb97bb8824d17eca619da523e601230b292031819e21b281e842b527be17c' 
  AND token = '1IDv3FxcWDtOKtX6lqVvj8vS0QBC2AR1ilK+fGHfT8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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