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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba3075ec09f6cd48b9e599a478a8669ff004583ae409a1e81e6ecedd0ac2454' 
  AND token = 'jljQBhNUZisSiLe+LuCuqKWpj5n0j9sTf1wMKujacas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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