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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b4556bb7c4979493bef6e295aa727fd0cac1445c609fb17d67553ef03dbcf4' 
  AND token = 'lEO+ClOTL8tlyDx6aA+3hxgKDDwGW2OqxeYJTufL1e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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