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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc67faf89f94af21c1af53621144371eb4801864fde441559c2e03bb43d555a' 
  AND token = '8tPIjr52ouibdsoTVVOVo9ysMzwSwQiKhg5AM7ETciI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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