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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa69540f9f63a25ad31546aa56b5f4abb91ac5b22cb4877cd3b3856f12c96c4' 
  AND token = 'wU1TbsHCh4/1zncVcsVAN0jF54G9Pemno2BrgBtUU1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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