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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827a35ba8fe0805a09e2eaaf3a112ea4f6b390aed6be255dcb2e33bfddeaf43f' 
  AND token = 'g5bFF7znl/+7DWehSJDxWiw5y+wqYpIBOIakbX6JJfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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