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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9f1360a105170556652a47949f2743d240f138596d16d324134d39fbe161c5' 
  AND token = '7a4Sas4wX/xECPxpPDHnkU1lErdymGVMi3VMJ13TZLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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