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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b442e6c3e375e4c9a0276ddb2f12308edd083df45c375ebb3212ee5919c06999' 
  AND token = 'D+6kaf/I274tulGbth2E9DZv9X84A9cmbZOnnfLjszs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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