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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30731161aee9dc8d5286090bf7b3cd02e9b8a91b71b41c8ae736138bc7930eb' 
  AND token = 'r5h+IJcEmdK2p1VKTVfmViA7MT8OzHm2tJ1h14TVqZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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