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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25979b1197c691286537e2536c67f52e162cbf4c411cb799b6d90dce607da71c' 
  AND token = 'TzOSHOCh5Hw8Qb2lv5zrgTKaJzC7ABivCl0lBJAyq0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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