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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce0d899bd4f07246e46396d4e95ca614abc91b35eed4deca202577f34aa1ad0' 
  AND token = '2cVEphrIT7zrg2cq8Qqm4lgfU0gdxTSCfMfalc94MI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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