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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9e58ceb81548a730e8e0eb1555f9e744eb797b3d8c287a9b970d7f76614429' 
  AND token = '/aXzPGA1v2uafglWlRa4Eo3QlxcOFAZU9f0dB22sey0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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