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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71ed97a46dbdc157c3c20b7bf0df4797b30a9f9c797d79a8c0a8e1f7ed01003' 
  AND token = 'ismLKzmuLKaAKXGBKzvv3pQfzVodsfMoveV0FKOQ9oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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