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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf652827a8662e0db036091ea37100b4b6abc232ddf6ef2142fe4bd86ab9af60' 
  AND token = 'lfEByZRy/a9PXHD3JmC/bVklK/I74LGM4IA/uZBB3hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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