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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd904d1380b81b31384024e6d019f2f2d043c1fab8304300069ccb32c5fc0f7a' 
  AND token = 'VLC8msvoC9fgKBM12VJ2umdO1stzQn9BKWVDRE0QT0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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