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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c957dd951426fb8b83e069fe830a653ce66c178ea2316ada6c36ee4912f3e4e' 
  AND token = '7Xlezd3uqO0cEIMe8LluRGyPsJRH9LY2EX/7HwFIfZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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