SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd31f53f6849bb725de486d75977903b9057eca20f63c6cfd128cb6a8612cf44' 
  AND token = '9G8OEfUrc9z4h2RCG0kSwpBVej6gybp03vifJXUslZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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