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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7337c8f9819bbb04f30b8f070a3ba892c54a889f93521a7c0f78d0bae927c4' 
  AND token = 'uxtbbOwBvnt3MCTmuMYMinGvv2fbpBMKl71eztNMOu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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