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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717ec860f67cb0cf7afc05908d6c6a89435f1a7a5e7e1b2d6cc8042f6ef6f5a9' 
  AND token = 'jjqrx9nIefEQWVl67tHC7aqEt0EdoWfZfuq7oGLSimU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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