SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8cd374e2ce2078493059ba2d37611f6f23ea1d2141875a299fa7172efcb7ef' 
  AND token = 'Tm006ZFjwEuGHgri/iQ7bviaIJRYmaoq+fHELqsnXD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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