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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168730e808dddd7d7d55bb4061969866cfae92b8a0233e681d1d73f530822ae6' 
  AND token = 'DiWWBm+0cqSiptAQnom8YPUnDJD0TPQCGZaC/6ttXHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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