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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab28931ead281d327ba80cc4b5c1c504c9a5c1949cd885dfb25737ce6951e541' 
  AND token = '9nkL1RA4Pn0TkyWSPYIyJvt4/wRY6Ki5zGUKxQmqt5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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