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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02abf1f93cfc5befdbbd6087b9935d5b293653973e509fd26a02326a8673f5fc' 
  AND token = 'm/2rI2E78VI3ueBtVRNZSyWyQHHn3CMS9UiqFIP4SMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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