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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f24ed5d74d5f973140eefe4c37154b5ac2720918c316b3efdce856d016800c' 
  AND token = 'YbJdI7froYqfRQdsAFFiKtIb8EeQhfdk5q6/iIk/yLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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