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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b7d5134b4a26ee5e414594d8efdd1a3438ae5802f9d7b42d4a390b83c4dec7' 
  AND token = 'ReHsOu+phWGr42bqXMkZxQhjMwvgOk/UWi02Wqai6+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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