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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e074cd77fd75e7658f57cbf234cc1310365f63a2154b456ef249a83f1410e8' 
  AND token = 'F7T01Klc5Ri+elSf6WtBG1QM6+aIlozuoSTbCd84eUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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