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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcc419fffb0c9b91e6281bf3b1f52a8cf092cac848f356121ba76405f6daea1' 
  AND token = 'LfwzWvUEUn5rgIN9V0+xKOAq9CSUVNx0iaG9V2XtP/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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