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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d8f08854a884452c578eb3205fc92cd18d0ab4043982534b77c02f161e3795' 
  AND token = 'l5/NfKCC7i5Bl8asKWWiEld71QzKujCwm50rq/f+7n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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